Big disclaimer: I don't adhere to the 'rules' often preached on BP. I prefer the perspective of: a 'deal' is the transaction that fits your model (read: end-game), regardless of it's conformity or lack-thereof to a metric.
That said, I spent 7+ years trying to apply these rules in MSP and always struck out. When I did find a property that aligned, it was always in a rough part of town with a rental clientele I wasn't comfortable working with. Not to mention the time required to find the options. These metrics, in my opinion, are geared for mass growth acquisitions, scaling quickly, and likely dumping quickly when the sponge is dry.
My approach is different - buy and hold 4-5 SFR, pay them off, self manage, and retire from corporate 20 years early. No empires, planes, large employee staffs, etc. Just freedom, but I also have a family and am not willing to put in 80-hr weeks to do more. This means I always pay market-rates, but the homes are solid, take little to make rent-ready, and the clientele/renters are great (if vetted well).
As for 'do nothing until prices come down' - it's a 50/50. My last two purchased were in 2017 and 2019, and they've appreciated ~55K since. Both times I sat for two years waiting for the market to tank, got sick of waiting, and jumped in. You could sit on the sidelines or jump in - either have pros and cons. After all the waiting, I learned to put my money down. After a couple years the principal pay-down alone offsets most losses you'd see anyway. Two cents: always put 20% down to eliminate PMI and ensure you can survive downturns. Note: current politics and environmental factors (COVID, unemployment), make the gamble more risky today than last year. I'd wait until Feb 2021 myself.
Again, my approach appears to be different and may not suit you. Stating all this because it took years - and someone speaking this same message - for me to feel comfortable that my strategy was "acceptable", and maybe this statement will save you some headache. Envision the life you want, adopt a model that will support that life - then build it.
Best of luck!